<template>
    <div class="goodsinfo-container">
        <transition @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>

        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <swiper :lunbotuList="lunbotuList" :isFull="false"></swiper>
                </div>
            </div>
        </div>

        <div class="mui-card">
            <div class="mui-card-header">{{goodsinfo.title}}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价:<span class="old_price">￥{{goodsinfo.market_price}}</span>&nbsp;&nbsp;销售价:<span class="now_price">
                            ￥{{goodsinfo.sell_price}}</span>
                    </p>购买数量:<numbox @getCount="getSelectedCount" :max="goodsinfo.stack_quantity"></numbox>
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
                    </p>
                </div>
            </div>
        </div>

        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>商品货号:{{goodsinfo.goods_no}}</p>
                    <p>货存情况:{{goodsinfo.stack_quantity}}件</p>
                    <p>上架时间:{{goodsinfo.add_time | dateFormat}}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图片介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>

    </div>
</template>

<script>
    import swiper from "../../components/subcomponents/swiper.vue"
    import numbox from "../../components/subcomponents/goodsinfo_numbox.vue"

    export default {
        data() {
            return {
                id: this.$route.params.id,
                lunbotuList: [],
                goodsinfo: {}, //获取到的商品的信息
                ballFlag: false, //控制小球的顯示和展示
                selectedCount: 1
            }
        },
        created() {
            this.getLunbotu();
            this.getGoodsInfo();
        },
        methods: {
            getLunbotu() {
                this.$http.get('getthumimages/' + this.id).then(result => {
                    console.log(result.body.status);
                    if (result.body.status === 0) {
                        result.body.message.forEach(element => {
                            element.img = element.src;
                        });
                        this.lunbotuList = result.body.message;
                    }
                });
            },
            getGoodsInfo() {
                this.$http.get('goods/goodsinfo/' + this.id).then(result => {
                    if (result.body.status === 0) {
                        this.goodsinfo = result.body.message[0];
                    }
                });
            },
            //点击使用编程式导航跳转到图文介绍页面
            goDesc(id) {
                this.$router.push({
                    name: "goodsdesc",
                    params: {
                        id
                    }
                });
            },
            //点击使用编程式导航跳转到评论页面
            goComment(id) {
                this.$router.push({
                    name: "goodscomment",
                    params: {
                        id
                    }
                });
            },
            addToShopCar() {
                this.ballFlag = !this.ballFlag;
                //拼接处一个要保存到store中car的数组对象
                var goodsinfo = {
                    id: this.id,
                    count: this.selectedCount,
                    price: this.goodsinfo.sell_price,
                    selected: true
                }
                //調用store裏面的方法把數據加入到store裏面的car數組裏面去
                this.$store.commit('addToCar',goodsinfo);
            },
            beforeEnter(el) {
                el.style.transform = "translate(0,0)";
            },
            enter(el, done) {
                el.offsetWidth;

                //小球动画优化思路
                //1.先分析导致动画不准确的原因：就是小球的最终的位子是写死的
                //只要分辨率不一样，或者滚动之后就会有错误

                //获取小球在页面中的位子
                const ballPosition = this.$refs.ball.getBoundingClientRect();
                const badgePosition = document.getElementById('badge').getBoundingClientRect();

                const xDest = badgePosition.left - ballPosition.left;
                const yDest = badgePosition.top - ballPosition.top;

                el.style.transform = `translate(${xDest}px,${yDest}px)`;
                el.style.transition = 'all .5s cubic-bezier(.56,.01,1,1)';
                done();
            },
            afterEnter(el) {
                this.ballFlag = !this.ballFlag;
            },
            getSelectedCount(count) {
                this.selectedCount = count;
                console.log(this.selectedCount);
            }
        },
        components: {
            swiper,
            numbox
        }
    };
</script>

<style lang="scss" scoped>
    .goodsinfo-container {
        background-color: #eee;
        overflow: hidden;
    }

    .old_price {
        text-decoration: line-through;
    }

    .now_price {
        color: red;
        font-size: 20px;
        font-weight: bold;
    }

    .mui-card-footer {
        display: block;

        button {
            margin: 10px 0;
        }
    }

    .ball {
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: red;
        position: absolute;
        z-index: 99;
        top: 390px;
        left: 144px;
        // transform: translate(20px, 100px);
    }
</style>